Dream last night

I had a dream that I remembered when I was driving to work and then forgot all day, and now I just remembered it again.

In my dream, I went to a Saturn dealership and looked at a new car and decided I'd like to buy it. The saleslady saw me and had me sign a few forms and the car was mine! She helped me get all my things out of my car and into the new one. But then I realized she never even asked if I had a trade-in, and I chased after her and said, "Wait! Don't I get to trade in my old car towards the purchase of the new car?" and she said No, because I had never mentioned it when I came in, and too bad. Then she started to drive off in my old car!!! I had been ripped off!

I ran back into the dealership and tried to find a sales manager to try to explain what happened, but I woke up before I could talk to anyone.

OPEN TO INTERPRETATION, cuz I sure don't get it!